Coffee filter



FIG. 1 is a perspective view of a coffee filter, showing the new design in a folded configuration;

FIG. 2 is a perspective view thereof, illustrated in a flat configuration;

FIG. 3 is a top plan view of FIG. 2, the bottom plan view being a mirror image thereof;

FIG. 4 is a left-side elevational view of FIG. 2, the right-side elevational view being a mirror image thereof; and,

FIG. 5 is a front elevational view of FIG. 2, the rear elevational view being a mirror image thereof. 

The ornamental design for a coffee filter, as shown and described. 